Plasmid types

Are conjugative plasmids and the F factor(plasmid) the same thing? Or is the f factor a type of conjugative plasmids which also include the R factor. Does the r factor also have genes for encoding pili and do all conjugative plasmids code for pili?Im confused because the book classified plasmids in two ways:according to transfer ability and according to functions. And they explained how bacteria containing the f factor could transfer antibiotic resistance. And in the classification they said that the r factor has genes for antibiotic resistance.What is the relation between the f factor, r factor and conjugative plasmids? Also are stringent and relaxed plasmids the same as conjugative and nonconjugatuve plasmids? Im so confused pleaseeee help.